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Enhancing membrane performance for CO2 capture from flue gas with ultrahigh MW polyvinylamine

Journal Article · · Journal of Membrane Science
 [1];  [2];  [2];  [2]
  1. The Ohio State Univ., Columbus, OH (United States); The Ohio State University
  2. The Ohio State Univ., Columbus, OH (United States)
Membranes for post-combustion CO2 capture are required to have a high CO2 permeance due to the limited driving force. For facilitated transport membranes synthesized with polyvinylamine (PVAm), a defect-free selective layer of <200 nm is usually required to render sufficient permeance with high CO2/N2 selectivity. In order to meet such a demand through the knife-coating process, the coating solution needs to have a high viscosity at a relatively low concentration to minimize its penetration into the substrate. The demand was met by synthesizing PVAm with an ultrahigh molecular weight (MW) via inverse emulsion polymerization (IEP) in this study. Compared to solution polymerization, IEP isolates the reaction in inverse micelles suspended in a continuous organic phase, which allows excellent dissipation of the heat generated by the reaction and reduces gel formation drastically. The polymerization parameters, including monomer concentration, initiator concentration, and reaction temperature, were investigated to obtain the optimal MW of PVAm for membrane performance. As compared to solution polymerization, IEP enhanced the MW of PVAm from 1.2 to 12.7 MDa, which minimized the penetration of the coating solution into the substrate and hence the extra mass transfer resistance. The effect of MW and degree of hydrolysis of PVAm on the membrane transport properties were studied. Furthermore, by employing PVAm with a MW of 12.7 MDa to strengthen the polymer matrix, the loading of piperazine glycinate in the membrane was increased up to 85 wt.%. In conclusion, the resultant membrane achieved a CO2 permeance of 839 GPU and a CO2/N2 selectivity of 161 at the typical flue gas temperature of 57°C.
Research Organization:
The Ohio State Univ., Columbus, OH (United States)
Sponsoring Organization:
USDOE; USDOE Office of Fossil Energy (FE)
Grant/Contract Number:
FE0026919; FE0031635; FE0031731
OSTI ID:
1778637
Alternate ID(s):
OSTI ID: 1778640
OSTI ID: 1782275
Journal Information:
Journal of Membrane Science, Journal Name: Journal of Membrane Science Vol. 628; ISSN 0376-7388
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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